PHP邮件错误：SMTP连接（）失败

Question

I had not any problems before, but i have checked today and i get the following error: Mailer Error: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting. I run my website on Heroku app. I use the latest version of php Mailer with google smtp servers. Are there any alternative smtp servers i can use? Here is my Script:

<?php
require 'PHPMailer-master/PHPMailerAutoload.php';


    if(empty($_POST['Email'])){
        $_POST['Email']= "";
    }
    if(empty($_POST['Name'])){
        $_POST['Name']= "";
    }
    if(empty($_POST['Subject'])){
        $_POST['Subject']= "";
    }
    if(empty($_POST['message'])){
        $_POST['message']= "";
    }


if (isset($_POST["message"]) && !empty($_POST["message"])) {

   $mymail=smtpmailer("[e-mail]",$_POST['Email'], 
$_POST['Name'], $_POST['Subject'], $_POST['message']);  


}else{  
    header('Location: http://webdominar.xyz'); exit();

}



function smtpmailer($to, $from, $from_name, $subject, $body) {
    $mail = new PHPMailer;
    $mail->isSMTP();
    $mail->Debugoutput = 'html';
    $mail->Host = 'smtp.gmail.com';
    $mail->Port = 587;
    $mail->SMTPSecure = 'tls';
    $mail->SMTPAuth = true;
    $mail->Username = '[e-mail]';  
    $mail->Password = '1234';          
    $mail->SetFrom($from, $from_name);
    $mail->Subject = "Webdominar Contact form ~Name: $from_name ~ subject: $subject
 on http://webdominar.xyz ";
    $mail->CharSet  = 'UTF-8';
    $mail->isHTML(true);                                  // Set email format to HTML

    $mail->Body = "blabla" ; //end body


    $mail->AddAddress($to);
//send the message, check for errors
if (!$mail->send()) {
    echo "Mailer Error: " . $mail->ErrorInfo;

} else {
    echo "Well done $from_name, your message has been sent!
We will reply to the following email: $from"
            . "<br>Your Message: $body";
}




} //end function smtpmailer



?>